Tired and exhausted of being depressed

The constant feeling of exhaustion because I'm dealing with soo much all the time. My education which I'm failing at; my social life which is failing; the want to be alone but the instant regret of isolating myself. I Just find it hard to know what I want but it always just turns into sleeping. I'm actually terrified of opening up to people about anything that's remotely significant to me but I can no longer cope with bottling everything up. Instead dealing with my own problems and issues, I take on other people's issue as it's easier to help others than myself but once I've helped in anyway I can with people I still find myself alone and lost. I just don't know what to do: I can't talk to people because I'm terrified and I freeze but at the same time I cannot continue the way in going because I can't handle it. I guess I'm just tired of constantly feeling lost and exhausted because I don't know what I feel, why I feel it or what I want. I have an unbelievable amount of work to do for my education but I can't do it because I'm too tired after pretending I'm alright to my friends all day so I end up sleeping as soon as I get home. I know I need help, maybe from a professional but I can't bring myself to it